Office



(No Model.)

T. J. a P. T. CURRIBR.

DRILLING MACHINE. No. 287,366. Patented 001;. 23, 1883.

v4 mi? i III TiMo'THY J. CURRIER AND FRANK DRILLING- 'i .Nini-:n STATESvT. comme, or WORCESTER, MASS.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 287,366, dated October23, 1883,

Application filed December 16, 1882. Y(Xo model.) I

To all whom it may concern Be it known that we, TIMOTHY J. CURRIER andFRANK T. CURRIER, citizens of the United States, residing at Vorcester,in the county of IVorcester and State of Massachusetts, have invented anew and useful Improvement in Drilling-Machines, the nature and objectsof which are fully set forth in the following specification, referencebeing had-.to the accompanying drawings, which illustrate our invention,and in whichl Figure l represents a side elevation of our improveddrilling-machine; Fig. 2, a side elevation of aportion, showing thefeeding77 device; Fig. 3, a front elevation of the same; Fig. 4, aninterior view of the clutch; Fig. 5, a sectional view of the same; Fig.6, a sectional View of the post online x x,- Fig. 7, a

top view yof the sliding head; and Fig. 8 repupon the table @,which iscapable of the usual adjustments common in drilling machines.Theodrill-spindleB rotates in the two supporting-heads D and E, the headD being fixed to the post B and carrying the' gear-wheel A5, throughwhich the drill-spindle B slides, a

spline and groove causing a rotary motion of the spindle. The headEslides upon ways on the face of the,post B, held by the gibs g g. Thevertical sliding motion of the head E is imparted to the drill-spindleby means of the collars a a, attached to the spindle B. A verticalfeeding motion is given to the sliding head E by means of the pinion F,on the shaft F', rotating in the rack F2, xed to the post B. The pinionF is driven by the Ihand-wheel G on the short transverse shaft G,whichcarries the endless screw or worm G2, driving the worm-wheel G3, whichactuates the shaft F by the four pawls b b b b, engaging theratchetwheel II, xed to the' shaft F, one pair of the pawls driving the.ratchet-wheel in one direction and the other pair in the oppositedirection. The shaft F has a slidingy sleeve, I, having handles c c anda pin, d, which passes through a slot', e, in the shaft F,and by whichallowing aquick return motion7 vto be given to the drill-spindle andhead E. In order to operate the pinion F by means of the handles fromthe ratchet H, which is effected asfollows: Each of the pawls has'ashort arm, f, Figs. 4 and 5, projecting forward at right augles to .andfrom the free end of the pawl,and the sliding sleeve I carries at itsinner enda conical ring, I, whose beveled surface, sliding under thearms f, raise the pawls b, and thereby disengage the worm-gear G3,permitting the shaft F to be operated by the handles c c.

Upon the transverse shaft G we place the worm-gear J, attached to theshaft G by any suitable clutching device by which it may be connected toor disconnected from the Shaft G at will. This gear J is driven by theworm J on shaft J 2,' which latter is held in suitable bearings attachedto the sliding head E, and having a sliding motion throughthe bevelgearK as the head E is moved up or down.

the bevel-gear K, (by means of a spline and groove,) the bevel-gear K',shaft L, and pulley L2, driven by the pulley L3 .on the main shaft A?.The pulley L runs loose on the shaft A3, beside the druml M, fixed tothe shaft. A cam, N, having a handle, N', turning on theshaft andpressing against the camsurface on the box N2, serves to slide thepulley L:i onto the drum M, as shown in Fig. 8, forming afriction-clutch, and thereby applying power to pulley L3 and the feedingmechanism'. When the pulley is released by the cam N, the spring N3separatesthe drum and pulley, thus disconnecting the feeding mechanismfrom the driving-shaft A3.

In the operation of .drilling the pressure upon the drill-spindle isupward, causing an undue strain upon the gibs g g. To obviate this, wemake a groove, P,.in the face. of the post and attach a tongue, P', tothe sliding l head E, causing it'to project upward for some distance, asat P2, Fig. 3. This tongue, as the the shaft may be rotated by thehandles c c,

Power is imparted to the sliding shaft J 2V by Y c c, the pawls b b b b'must first be disengaged IOO head E moves up or down, slides in thegroove P, resting against ,the bottom of the groove, the part P passingunderI the head D. By this construction we get a much greater length ofbearing-surface to resist the vertical pressure against the drill. Vehave shown the groove P in rectangular section, but we do not confineourselves to this form. It can be made with beveled sides and the tongueP dovetailed into the groove, so as to secure the head to the post andrender the use of the outside gibs, g g, unnecessary.

IVe are aware that drilling-machines have been heretofore made havingheads capable of sliding on the post, for the purpose of 'adjusting theposition of the drill with reference to -the work; but in the operationofdrilling the head is fastened to the-post, and the feeding motiongiven to the drill-spindle by means of a slide passing through the headE, and

within which the drill rotates. This mode of feeding vthe drill has-twoobvious disadvantages, viz: As the head E remains stationary and thedrillspindle advances downward, the distance between the point of thedrill and the support in the head E is constantly changing, and in holesof considerable depth the strain at the point of the 'drill is brought`at too great a distance from the head; again, the bearing of thedrill-spindle in the slide is subject to wear, which soon interfereswith the accuracy of the work; but by our improved mode of feeding thesliding head E we maintain the same distance between the point of thedrill and the head E, and we are able to inclose the drill-spindle in anordinary box, by which any lost motion may be taken up,

and this result is accomplished by making the rack F2 stationary andfixed to the post, and attaching the feeding mechanism to the slidinghead E. We are also able to readily connect our feeding mechanism withthe power used to drive the drill, and that without stopping the drillbyl connecting the worm gear J to the transverse shaft G', and thefriction clutch-pulley' L3 to the shaft A3.

' Vhat we claim as our-invention, and desire to secure by LettersPatent, is*

1. In a drilling-machine, the combination,v

with a post having a fixed head and a drill- 'spindle sliding throughthe fixed head, of a sliding head carrying the drill-spindle and slidingon ways on the post, and suitable mechanism for imparting a feedingmotion to 5 5A the sliding head on 'the post during the opera- -tion ofdrilling, as and for the purpose set forth.

2. n1 a (inning-machine, the combination of post B', fixed head D,sliding drill-spindle B, sliding head E, carrying the drill-spindle andsliding on ways on the post B', Witha fixed rack attached to the post,and rotating pinion journaled on the sliding head and engaging the fixedrack, with means for rotating the.

pinion, whereby a feeding motion may be parted to the sliding headandconnected drillspindle, as and for the. purpose set forth.

3. In a drilling-machine, the combination,

with the drill-spindle B and sliding head E, sliding on ways on the postand carrying the drill-spindle, of the pinion F, shaft F', fixed rackF2, worm-gear G3, attached to the shaft F' by a clutch, so as to bedisconnected at will,

the worm G2, and shaft G', with connected mechanism for rotating theshaft- G', as and for the purpose set forth.

et. The combination, with the drill-spindle beveled ring, with itsconnected sleeve sliding upon but capable of turning the shaft F', andhaving the handles c c, as and for the purpose set forth.

6. rPhe co1nbination,'with the driving-shaft A3 and the connectedfeeding mechanism coni- B and sliding head E, of the hand-wheel G, v

prehending the rotating pinion F, journaled on the sliding head E, and afixed rack on the post B', as described, of a clutching device on theshaft A, whereby the feeding mechanism may be disconnected from thedriving-shaft, as and for the purpose set forth.

7 In a drilling-machine, the combination, with the sliding head, asdescribed, of atongue sliding in a groove formed in the post andextending upward beyond the head E, so as to increase the length of thebearing-surface and serve to resist the pressure against the drill inthe operation of drilling, as and for the purpose set forth. f

TIMOTHY J. onnninn.

FRANK T. oUnninR.

Viinesses:

DAVID MANNING, J r., P. N. BLACKMER.

IOO

